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Overview of the Current Week
2025/09/05 - 2025/09/12
A red tide has been sighted over the past week, the Inter-departmental Red Tide Working Group reported today (September 12).
The red tide was spotted by staff of the Agriculture, Fisheries and Conservation Department (AFCD) on September 10 at the waters in Sha Tin Hoi. The red tide still persists and no associated fish deaths have been reported as of today.
A spokesman for the working group said, "The red tide was formed by Pseudo-nitzschia calliantha, which is not common in Hong Kong waters. According to literature overseas, the algal species might produce toxin. However, no such reports have been recorded in Hong Kong so far."
The AFCD urged mariculturists at Yim Tin Tsai, Yim Tin Tsai (East), Yung Shue Au and Lo Fu Wat fish culture zones to monitor the situation closely and increase aeration where necessary.
Red tide is a natural phenomenon. The AFCD's proactive phytoplankton monitoring programme will continue to monitor red tide occurrences to minimise the impact on the mariculture industry and the public.
Please click here to view the location of red tide sighted in Hong Kong waters.
You can visit the Hong Kong Red Tide Information Network for information about red tide or press here to view real-time water quality in fish culture zones.
Last update: 2025/09/12 noon
Red Tide Reporting Network
We welcome your assistance in reporting red tide to us. Please record the following information:
(1) location of red tide
(2) colour of the seawater
(3) extent of the red tide
(4) occurrence of dead fish and any other abnormal features observed around the red tide.
Please report to:
3468 3714 (office hours) OR 1823 (outside office hours)
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